63. After an expression has been properly plotted on a Veitch
diagram, a simplified expression is easily extracted.
Learn to
describe the plotted squares with as few terms as possible.
First, look for patterns of four plotted squares which describe a
one-variable term, as follows:
As indicated by the diagrams above, when the four plotted squares
cover all the squares assigned to one variable, the plot can be
represented by that one variable.
The expression ABC+ABC+AB is
plotted as follows:
It is evident that the four plotted squares include all the
squares assigned to A.
Therefore, the expression ABC+ABC+AB can
be simplified by extracting the term which is common to these
four squares--in this case, A.
IT0345
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